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Re: ACPI with AMD64


powernow is working without problems (processor is switching between 1800MHz and 1000 MHz):

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies:
1800000 1000000

Only switching between power states C1, C2, C3, .. (which is a different thing than cpu scaling) isn't available.

I have a ASUS A8N-Premium Motherboard, powernow is enabled.

Can you post the output of


At 13:19 10.02.2006, you wrote:
Thimo Eichstaedt (abc@digithi.de) wrote:
> Hi folks,
The CPU does support powesaving, but does the BIOS?
Which motherboard do you have, and do you have powernow/cool'n'quiet enabled in BIOS?

> I have an Athlon AMD 64 3000 MHz and want to use its powersaving futures. Therefore I am using PowerNow with the powernow_k8 module. This is working
> great.
> Additionally it should be possible to profit from the power states of the processor (C1...C8). But the ACPI module tells me that only C1 is availabe:
> Modules loaded: processor, powernow_k8, cpufreq_userspace
> dmesg output when loading processor.ko module:
> ...
> ACPI: CPU0 (power states: C1[C1])
> ...
> cat /proc/acpi/processor/CPU0/power:
> active state:            C1
> max_cstate:              C8
> bus master activity:     00000000
> states:
> *C1: type[C1] promotion[--] demotion[--] latency[000] usage[03559864]
>   cat /proc/acpi/processor/CPU0/throttling
> <not supported>
> Is this correct or what have I done wrong ? Can anybody with a AMD64 processor perhaps post its proc output ?
> Thanks
>    Thimo
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